We're big fans of the work of longtime actor Sylvester Stallone, whose film credits include some of our favorite action movies like Rambo and Cobra, as well as cult classic like the Rocky series and Over the Top.

And, while we're always impressed that the 71-year-old Sly looks as if he could still kick anyone's ass who gives him too much sh-t, we're going to focus on his daughter today, Sophia Rose Stallone, who's a bigger knockout than any of those fights he won in the Rocky films.

Just recently celebrating her 21st birthday, Sophia was spotted on her dad's Instagram account the other day and, whoa, did she ever catch our eye, clearly showing off the mature look that would make any man swoon.

A communications major and sorority girl at the University of California, Sophia Rose Stallone is the oldest of three daughters that Sly has, with the trio of ladies making an appearance with their dad and mom, former model Jennifer Flavin, at this year's Golden Globe Awards. Needless to say, they all caught the eyes of plenty of people.

Sophia is a total stunner, but she's had her fair share of adversity, too, even undergoing open heart surgery back in 2012 at the age of 16, as reported by *Hello magazine But, according to that Hello mag piece, via Paris Match mag, she can only do what she can to keep herself as healthy as possible:

"Every day I think of my heart," Sophie tells Paris Match magazine. "I eat really healthy, and as I get more tired than normal, I have to be very careful when doing sports. Now I have to have surgery again because the tissue they put in 16 years ago has widened and I have problems with the valves. If all goes well, I will spend five days in the hospital."

Seemingly fully recovered, Sophia Rose Stallone can focus on doing normal, 21-year-old things — and her Instagram account is proof of that, because it shows lots of photos of her having fun and looking really good. We think you'll agree that a crush is definitely brewing here.

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